forked from TrueCloudLab/frostfs-node
Dmitrii Stepanov
8ed71a969e
If no tags specified, then limiter could be optimized to use atomic semaphore. Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
39 lines
784 B
Go
39 lines
784 B
Go
package qos
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import (
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"context"
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"errors"
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qosSemaphore "git.frostfs.info/TrueCloudLab/frostfs-qos/limiting/semaphore"
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"git.frostfs.info/TrueCloudLab/frostfs-qos/scheduling"
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)
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var (
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_ scheduler = (*semaphore)(nil)
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errSemaphoreLimitExceeded = errors.New("semaphore limit exceeded")
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)
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type semaphore struct {
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s *qosSemaphore.Semaphore
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}
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func newSemaphoreScheduler(size int64) *semaphore {
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return &semaphore{
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s: qosSemaphore.NewSemaphore(size),
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}
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}
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func (s *semaphore) Close() {}
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func (s *semaphore) RequestArrival(ctx context.Context, _ string) (scheduling.ReleaseFunc, error) {
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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if s.s.Acquire() {
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return s.s.Release, nil
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}
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return nil, errSemaphoreLimitExceeded
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}
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